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No Longer Made
BLACKBURN AR-1 and AR-2 ADJUSTABLE REAR RACKThis is the first of the Blackburn racks to have mass acceptance and is now discontinued. The AR-1 was extremely well engineered using 6061 aluminum rod that is shaped, then TIG welded together. This rack used three support rods welded together to form two stable and rigid triangles on both sides of the rack. The triangular supports gracefully transfer the weight load to the eyelets on the dropouts. At the eyelet, the outer support rods are flared to the front and rear so that panniers with bottom spring releases can be put on or taken off in seconds. This rack requires that you have caliper brakes, and for that reason, has always been used on Road racing, Road touring, or Tandem bikes. It is known as "adjustable" because it uses a sliding bracket which is bolted to the back of the rear brake caliper. Once the bracket is in place, the rack can be shifted front or rear to adjust it to a precisely level position. The rack is designed to carry objects on top, as well as a pannier set on the sides. The AR-1 has been severely tested, with failure weight rates well above what a human can possibly steer or travel with. It's overbuilt, yet light!! The AR-1 rack was made for bikes with a 19" to 24" frame. The AR-2 rack was for bicycle frames larger than 24". The rack weighs 442 grams and was made in Black or Silver.
BLACKBURN SS-1 SEATSTAY RACKThis is the rack preferred by many custom framebuilders for its clean and simple design, but is also doscontinued. It used four point mounting for rigidity, relying usually on brazed on frame eyelets (on the seatstay, and then rear dropout eyelets) for the rack to fasten to. Where eyelets don't exist there are vinyl coated clamps that grip the frame firmly. Perfect for braze-on or clamp style installation (seatstay clamps not included). The Seatstay racks were for narrow tire use only and come in three sizes, SS-1 for frames from 21"-23" The SS-2 was for frame sizes from 24"- 26". The SS-3 was for frame sizes from 18"-20". Formerly made in Black or Silver with an approximate weight of 452 grams |
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In-depth Information About Metals Aluminum Aluminum is extracted electrolytically from bauxite ore. It is made by the electrolysis of aluminum oxide which is found in larger concentrations within bauxite ore. Bauxite is a mixture of the hydroxides of aluminum, together with other impurities such as oxides of iron, titanium, and silicon. Bauxite is produced by the weathering and change of aluminum silicate rocks usually found in tropical and semitropical regions where climate has produced an accelerated weathering process. Bauxite is not a rare ore and is widely available in the US, the Caribbean, and Europe. Approximately 4 pounds of read the full article... Beryllium Beryllium is a specialty metal that is steel-grey metal in color, with an extremely low density, making it very light weight. At 1.85 grams to the cubic centimeter, its density compares to that of magnesium. It is also a high strength metal, making it possible to design light weight, thin membered parts with ahigh stiffness. A column made of beryllium to support a load placed directly downward on top of it, will have a greater load carrying capacity, and be lower in weight than any other metal of equal size. Until the 1950's beryllium was used read the full article... Titanium The element titanium was discovered in 1763 by an English cleric, William Gregor who was an amateur chemist with an inquiring mind. It was in the black sands of Cornwall that he discovered the new element that had up to that time, attracted little scientific interest. A few years later, an Austrian, Klaproth, extracted the same element from an ore widely known as "rutile", which is a mineral consisting of titanium dioxide (one titanium atom, two oxygen atoms), that is a reddish-brown substance with a slight metallic luster. While rutile is the highest grade read the full article... Metallurgic Hardness Testing There are three types of tests used with accuracy by the metals industry,they are the Brinell hardness test, the Rockwell hardness test, and the Vickers hardness test. Hardness is the property of a metal which gives it the ability to resist being permanently deformed (bent, broken, or have its shape changed), when a load is applied. The greater the hardness of the metal, the greater resistance it has to deformation. Since the definitions of metallurgic ultimate strength and hardness are rather similar, it can generally be assumed read the full article... |
